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Answer Wiki. The ionic charge of oxygen is -2. You can tell because oxygen is in group number 6, so it has 6 valence electrons. Since it needs 2 more electrons to become neutral with a full outer shell of 8 electrons, its charge is -2 (since adding electrons gives a negative charge).
Best Answer: Oxygen is element 8 So the atom of oxygen has 8 protons and 8 electrons. The ion has the same number of protons because you never loose a proton to make an ion. If your ion is 2- then you need 2 additional electrons so you would have 10 electrons.